Tax residency rules, audits, and the severance record (2026)
2026.1 Edition · Revised 2026-07-25 · DomusDay Research
Moving out of Colorado is easy. Stopping Colorado taxes is a different act, and it happens on paper: Colorado keeps treating you as a resident until the record shows otherwise.
On the burden of showing otherwise: Once established, domicile continues until deliberately changed by establishing a new domicile in another state — the Department weighs conduct-based evidence against the claimed change.
There is no day-count to get under. Colorado publishes no 183-day statutory test. Instead, the resident definition itself (C.R.S. §39-22-103(8); Department Rule 39-22-103(8)(a)) reaches non-domiciliaries: an individual who maintains a permanent place of abode in Colorado and spends, in aggregate, more than six months of the tax year in Colorado is a resident. The threshold is stated as six months — the Department states no day-count equivalent. A permanent place of abode may include a house, condominium, apartment, room in a house, or mobile home. That makes the evidence trail — where the pattern of an actual life points — the entire case. Everything on this page exists to answer one question: if DOR asks, does your record hold?
Colorado's resident definition reaches beyond domicile: maintaining a permanent place of abode and spending, in aggregate, more than six months of the tax year in Colorado makes an individual a resident. The threshold is stated as six months — Colorado publishes no 183-day count.
Source ↗Colorado taxes income at a flat 4.40%. In surplus years the Taxpayer's Bill of Rights returns revenue — sometimes as a temporary rate cut, as with 2024's 4.25% rate, and sometimes as a sales tax refund claimed on the income tax return.
Source ↗Closings of $100,000 or more where the seller shows a non-Colorado address carry withholding of the lesser of 2% of the sales price or the net proceeds, reported on Form DR 1083 and credited against the seller's Colorado income tax.
Source ↗Colorado publishes no 183-day statutory test. Instead, the resident definition itself (C.R.S. §39-22-103(8); Department Rule 39-22-103(8)(a)) reaches non-domiciliaries: an individual who maintains a permanent place of abode in Colorado and spends, in aggregate, more than six months of the tax year in Colorado is a resident. The threshold is stated as six months — the Department states no day-count equivalent. A permanent place of abode may include a house, condominium, apartment, room in a house, or mobile home. Days still matter — not as a threshold to duck under, but as evidence of where the year was actually lived, and as the trigger for the presumptions below.
Selling the apartment is not the test, and neither is the new driver's license. Colorado presumes an established domicile continues until it is shown to have changed — domicile — the place a person considers their home; the permanent place of abode to which they intend to return whenever away. On the burden: Once established, domicile continues until deliberately changed by establishing a new domicile in another state — the Department weighs conduct-based evidence against the claimed change. Examiners weigh 3 primary factors — resident return filing, real property, spouse and dependents — and they weigh what you did, not what you intended. The pattern of an actual life somewhere else is the evidence; everything else is secondary.
A clean exit does not end every Colorado claim. These rules keep taxing specific situations after the move — each one is a way the state stays in your return.
AffectsLeavers who keep Colorado workdays, businesses, or rental property.
AffectsFormer residents who sell a kept Colorado home or investment property after the move.
Colorado Department of Revenue, Taxation Division (DOR) runs a low-intensity residency program. The Department publishes no residency-audit program, guidelines, or statistics; residency guidance lives in the Individual Income Tax Guide and Income Tax Topics publications. An examination is not an argument about intentions — it is a request for documents, and the request looks like this:
Every item on that list either exists in your records from the year of the move, or it does not. That is the whole game — and why the severance record below is the section that matters most.
An audit years from now is answered with documents generated in the months around the move. This is that inventory — grouped the way examiners think about a life, each item paired with the evidence it leaves behind.
The change date splits the year on Form DR 0104PN: tax is calculated as though full-year, then apportioned by the percentage of income subject to Colorado tax. A retained Colorado abode keeps the six-month aggregate rule in play for the move year and every year after, and a later sale of kept Colorado property of $100,000 or more meets the 2% nonresident withholding at closing.
The driver's license is among the evidence the Department weighs in determining domicile.
Source ↗Motor vehicle registration is an enumerated item of domicile evidence in the Department's guide.
Source ↗Voter registration is an enumerated item of domicile evidence in the Department's guide.
Source ↗Keeping any Colorado dwelling that qualifies as a permanent place of abode — a house, condominium, apartment, room in a house, or mobile home — keeps the six-month resident definition live.
Source ↗Ownership and occupation of real property is an enumerated item of domicile evidence.
Source ↗Claimed in-state college tuition residency status is an enumerated item of domicile evidence.
Source ↗Where banking and financial relationships sit corroborates the claimed change in the overall pattern of conduct.
Where medical and professional relationships are established contributes to the conduct-based pattern.
The residency of the spouse and dependents is an enumerated item of domicile evidence.
Source ↗The destination of vehicles and significant possessions corroborates the claimed change.
Whether a state income tax return was filed as a resident is an enumerated item of domicile evidence.
Source ↗With any retained Colorado abode, aggregate time in the state controls — more than six months of the tax year, in aggregate, meets the resident definition.
Source ↗Colorado expects Form DR 0104PN with the DR 0104 for the change year — tax is computed as if full-year, then apportioned by modified Colorado AGI over modified federal AGI.
Source ↗Every rule on this page traces to one of these. When a blog and a statute disagree, the statute wins — start here.
How these are chosen, what the automated gates catch, and what this site deliberately does not do: how these guides are made →
The year of the move is filed on DR 0104PN, with income split between the resident and nonresident periods — and that return is itself evidence: it states your change date on a signed document. Wages are Colorado-source — and subject to withholding — when the employee was physically present in Colorado performing the work. Nonresident real estate sales of $100,000 or more carry closing-table withholding of the lesser of 2% of the sales price or net proceeds (DR 1083/DR 1079).
More than six months of the tax year, in aggregate, while maintaining a permanent place of abode in Colorado. The rule is a prong of the resident definition itself, and Colorado states it in months — no 183-day count is published. An abode can be a house, condominium, apartment, room in a house, or mobile home.
Domicile is the place a person considers home — the abode they intend to return to whenever away — and it continues until deliberately changed. The Department's evidence list includes the residency status claimed on returns, driver's license, vehicle and voter registration, where the spouse and dependents live, real property ownership and occupation, and in-state tuition status.
Colorado-source income: wages for work physically performed in Colorado, income from a Colorado business, and income from Colorado real and tangible property. Retirement income received by nonresidents is not Colorado-source. A later sale of Colorado property of $100,000 or more also carries closing-table withholding of the lesser of 2% of the sales price or net proceeds.
Form DR 0104PN — the Part-Year Resident/Nonresident Tax Calculation Schedule — filed with the DR 0104. Tax is computed as though full-year, then apportioned by modified Colorado AGI over modified federal AGI, so it falls only on income received in Colorado or from Colorado sources.
The DMV's new-resident windows are 30 days for the driver's license and 90 days for vehicle registration, with minimum liability coverage of $25,000/$50,000/$15,000 to drive. Voter registration is open in person through Election Day. There is no declaration-of-domicile instrument, and the creditor homestead exemption applies automatically without recording.
No inheritance tax, and the estate tax — tied to a federal credit that no longer exists — has been effectively eliminated for deaths after December 31, 2004. Colorado has collected no estate tax since fiscal year 2013-14.
2026.1 Edition · Revised 2026-07-25 · DomusDay Research